MyBatis TypeHandler phantom errors

I’ve found another annoyance with MyBatis (there are many so be on the lookout for a long blog post that covers everything). This one has to do with how MyBatis handles missing TypeHandlers and required a bit of time stepping through their code.

If you have an object that contains a field whose type is not registered with the TypeHandler registry, MyBatis does not always produce a nice exception for you. Instead, it sometimes decides to return null instead of creating your object.